"use strict";
var __importDefault = (this && this.__importDefault) || function (mod) {
return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.getLength = exports.decode = exports.encode = void 0;
var bn_js_1 = __importDefault(require("bn.js"));
/**
* RLP Encoding based on: https://github.com/ethereum/wiki/wiki/%5BEnglish%5D-RLP
* This function takes in a data, convert it to buffer if not, and a length for recursion
* @param input - will be converted to buffer
* @returns returns buffer of encoded data
**/
function encode(input) {
if (Array.isArray(input)) {
var output = [];
for (var i = 0; i < input.length; i++) {
output.push(encode(input[i]));
}
var buf = Buffer.concat(output);
return Buffer.concat([encodeLength(buf.length, 192), buf]);
}
else {
var inputBuf = toBuffer(input);
return inputBuf.length === 1 && inputBuf[0] < 128
? inputBuf
: Buffer.concat([encodeLength(inputBuf.length, 128), inputBuf]);
}
}
exports.encode = encode;
/**
* Parse integers. Check if there is no leading zeros
* @param v The value to parse
* @param base The base to parse the integer into
*/
function safeParseInt(v, base) {
if (v[0] === '0' && v[1] === '0') {
throw new Error('invalid RLP: extra zeros');
}
return parseInt(v, base);
}
function encodeLength(len, offset) {
if (len < 56) {
return Buffer.from([len + offset]);
}
else {
var hexLength = intToHex(len);
var lLength = hexLength.length / 2;
var firstByte = intToHex(offset + 55 + lLength);
return Buffer.from(firstByte + hexLength, 'hex');
}
}
function decode(input, stream) {
if (stream === void 0) { stream = false; }
if (!input || input.length === 0) {
return Buffer.from([]);
}
var inputBuffer = toBuffer(input);
var decoded = _decode(inputBuffer);
if (stream) {
return decoded;
}
if (decoded.remainder.length !== 0) {
throw new Error('invalid remainder');
}
return decoded.data;
}
exports.decode = decode;
/**
* Get the length of the RLP input
* @param input
* @returns The length of the input or an empty Buffer if no input
*/
function getLength(input) {
if (!input || input.length === 0) {
return Buffer.from([]);
}
var inputBuffer = toBuffer(input);
var firstByte = inputBuffer[0];
if (firstByte <= 0x7f) {
return inputBuffer.length;
}
else if (firstByte <= 0xb7) {
return firstByte - 0x7f;
}
else if (firstByte <= 0xbf) {
return firstByte - 0xb6;
}
else if (firstByte <= 0xf7) {
// a list between 0-55 bytes long
return firstByte - 0xbf;
}
else {
// a list over 55 bytes long
var llength = firstByte - 0xf6;
var length_1 = safeParseInt(inputBuffer.slice(1, llength).toString('hex'), 16);
return llength + length_1;
}
}
exports.getLength = getLength;
/** Decode an input with RLP */
function _decode(input) {
var length, llength, data, innerRemainder, d;
var decoded = [];
var firstByte = input[0];
if (firstByte <= 0x7f) {
// a single byte whose value is in the [0x00, 0x7f] range, that byte is its own RLP encoding.
return {
data: input.slice(0, 1),
remainder: input.slice(1),
};
}
else if (firstByte <= 0xb7) {
// string is 0-55 bytes long. A single byte with value 0x80 plus the length of the string followed by the string
// The range of the first byte is [0x80, 0xb7]
length = firstByte - 0x7f;
// set 0x80 null to 0
if (firstByte === 0x80) {
data = Buffer.from([]);
}
else {
data = input.slice(1, length);
}
if (length === 2 && data[0] < 0x80) {
throw new Error('invalid rlp encoding: byte must be less 0x80');
}
return {
data: data,
remainder: input.slice(length),
};
}
else if (firstByte <= 0xbf) {
// string is greater than 55 bytes long. A single byte with the value (0xb7 plus the length of the length),
// followed by the length, followed by the string
llength = firstByte - 0xb6;
if (input.length - 1 < llength) {
throw new Error('invalid RLP: not enough bytes for string length');
}
length = safeParseInt(input.slice(1, llength).toString('hex'), 16);
if (length <= 55) {
throw new Error('invalid RLP: expected string length to be greater than 55');
}
data = input.slice(llength, length + llength);
if (data.length < length) {
throw new Error('invalid RLP: not enough bytes for string');
}
return {
data: data,
remainder: input.slice(length + llength),
};
}
else if (firstByte <= 0xf7) {
// a list between 0-55 bytes long
length = firstByte - 0xbf;
innerRemainder = input.slice(1, length);
while (innerRemainder.length) {
d = _decode(innerRemainder);
decoded.push(d.data);
innerRemainder = d.remainder;
}
return {
data: decoded,
remainder: input.slice(length),
};
}
else {
// a list over 55 bytes long
llength = firstByte - 0xf6;
length = safeParseInt(input.slice(1, llength).toString('hex'), 16);
var totalLength = llength + length;
if (totalLength > input.length) {
throw new Error('invalid rlp: total length is larger than the data');
}
innerRemainder = input.slice(llength, totalLength);
if (innerRemainder.length === 0) {
throw new Error('invalid rlp, List has a invalid length');
}
while (innerRemainder.length) {
d = _decode(innerRemainder);
decoded.push(d.data);
innerRemainder = d.remainder;
}
return {
data: decoded,
remainder: input.slice(totalLength),
};
}
}
/** Check if a string is prefixed by 0x */
function isHexPrefixed(str) {
return str.slice(0, 2) === '0x';
}
/** Removes 0x from a given String */
function stripHexPrefix(str) {
if (typeof str !== 'string') {
return str;
}
return isHexPrefixed(str) ? str.slice(2) : str;
}
/** Transform an integer into its hexadecimal value */
function intToHex(integer) {
if (integer < 0) {
throw new Error('Invalid integer as argument, must be unsigned!');
}
var hex = integer.toString(16);
return hex.length % 2 ? "0" + hex : hex;
}
/** Pad a string to be even */
function padToEven(a) {
return a.length % 2 ? "0" + a : a;
}
/** Transform an integer into a Buffer */
function intToBuffer(integer) {
var hex = intToHex(integer);
return Buffer.from(hex, 'hex');
}
/** Transform anything into a Buffer */
function toBuffer(v) {
if (!Buffer.isBuffer(v)) {
if (typeof v === 'string') {
if (isHexPrefixed(v)) {
return Buffer.from(padToEven(stripHexPrefix(v)), 'hex');
}
else {
return Buffer.from(v);
}
}
else if (typeof v === 'number' || typeof v === 'bigint') {
if (!v) {
return Buffer.from([]);
}
else {
return intToBuffer(v);
}
}
else if (v === null || v === undefined) {
return Buffer.from([]);
}
else if (v instanceof Uint8Array) {
return Buffer.from(v);
}
else if (bn_js_1.default.isBN(v)) {
// converts a BN to a Buffer
return Buffer.from(v.toArray());
}
else {
throw new Error('invalid type');
}
}
return v;
}
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